I have a '07 JK that has a radio that works intermittently. I went to a salvage yard and pulled a radio out of a '12 Jeep Patriot. The radio and harness install fine. The radio's backlights come on when the Jeep is started, but the whole unit will not power up. Do I need a security code for the radio? I have read that all cars post 2012 require security codes to be entered, but this radio does not prompt me to enter one.